FraMCoS 4 2001 Cachan, France

Anisotropicdamagemodelfornonlinearcreepbehaviorofconcreteincompression

An isotropic model for creep damage of concrete in compression is proposed, where the com- bined effect of non linear viscous strain evolution and crack nucleation and propagation at high stress levels is considered. Strain splitting assumption is used for…

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Year 2001
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Abstract

An isotropic model for creep damage of concrete in compression is proposed, where the com- bined effect of non linear viscous strain evolution and crack nucleation and propagation at high stress levels is considered. Strain splitting assumption is used for creep and damage contributions. Creep is modelled by a modified version of solidification theory. Concrete damage is governed by a damage index based on positive strains. As particular cases, the proposed model reduces to linear viscoelasticity for long time low stress levels whereas, for very high stresses, tertiary creep causing failure at a finite time can be described. The model is validated through comparison with experimental results. Some numerical example are also presented, where the roles of concrete ageing and strength variation with time are investigated.